DE102019216874A1 - PROCEDURE AND PROCESSING ARRANGEMENT FOR A HYDRAULIC PRESSURE MEDIUM - Google Patents

Abstract

The present invention relates to a treatment arrangement (1000) for degassing and / or drying a hydraulic pressure medium, the arrangement (1000) comprising: a container (100) which is configured to receive a predetermined amount of pressure medium; an inlet opening (101) for the pressure medium, which is arranged at an upper portion of the container (100) and through which the pressure medium can be supplied into the container (100); an outlet opening (104) for the pressure medium, which is arranged on a lower section of the container (100) and through which the pressure medium can be discharged from the container (100); a ventilation device (200, 200 ') configured to supply a flow of gas into the container (100), wherein a porous end portion (201) of the ventilation device (200, 200') is at a central lower position of the container (100) is arranged so that bubbles of the gas are distributed in a section of the container (100) filled with the pressure medium and a flow of the bubbles is formed from bottom to top in the section of the container (100); wherein the outlet opening (104) is arranged at a lower portion of the container (100) below the porous end portion (201). It also relates to a method for degassing and / or drying a hydraulic pressure medium.

Description

TECHNICAL PART

The present invention relates to the technical field of pressure medium processing systems which are configured to remove dirt, pressure medium aging products, gases and free and dissolved water from a pressure medium, in particular from hydraulic and lubricating oils. In particular, the present invention relates to a method for drying and / or degassing a hydraulic pressure medium and a processing arrangement for drying and / or degassing a hydraulic pressure medium.

STATE OF THE ART

Hydraulic systems with degassing devices and drying devices are known from the prior art. For example, the DE 10 2016 226 283 A1 a hydraulic arrangement which comprises a degassing device for hydraulic pressure medium and a container or line section fluidically connected to the degassing device, which is set up to be at least partially filled with the hydraulic pressure medium in an operating state. An outflow device for a gas, in particular for dry compressed air, is provided in the container or line section, the outflow device being arranged such that it is arranged in the pressure medium in the operating state.

Through this device, dry gas or compressed air is introduced directly into the hydraulic pressure medium so that gas bubbles are formed in the pressure medium. The many small gas bubbles have a large surface compared to the gas volume and therefore absorb moisture from the pressure medium very quickly. Moisture contained in the pressure medium thus passes over into the gas in the gas bubbles and can be separated out in a comparatively simple manner together with the gas bubbles in a degassing device.

However, this device has the major disadvantage that it is very voluminous and, as a result, its transport and installation in an industrial plant is very expensive.

It is the object of the present invention to create a hydraulic arrangement that is as simple and compact as possible, with which the pressure medium can actually be dried efficiently.

SHORT VERSION

The present invention is based on the idea that the gas required for drying the pressure medium is supplied between an inlet opening and an outlet opening of the pressure medium. With this solution, the degassing and / or drying of the pressure medium can take place in a compact axial structure.

According to one embodiment of the present invention, a method for degassing and / or drying a hydraulic pressure medium is provided. In this method, a pressure medium is fed into a container through an inlet opening of the container, the inlet opening being arranged at an upper portion of the container. In addition, a gas is fed into the container through a ventilation device, wherein a porous end portion of the ventilation device is arranged at a central lower position of the container, so that bubbles of the gas are distributed in a portion of the container filled with the pressure medium and a flow of the bubbles forms from the bottom up in the section of the container. In addition, the pressure medium is discharged from the container through an outlet opening of the container, wherein the outlet opening is arranged at a lower portion of the container below the porous end portion. This method is particularly advantageous because it enables the pressure medium to be dehumidified and / or degassed efficiently in a very compact arrangement. The container is preferably more elongated to allow dehumidification to take place along the major axis of the container. By “elongated” it is meant that the container extends along a major axis and that the length of the container along this major axis is significantly greater than a length of the container measured along any other axis.

According to one embodiment of the present invention, a processing arrangement for degassing and / or drying a hydraulic pressure medium is provided, the arrangement comprising a container which is configured to receive a predetermined amount of pressure medium; wherein the arrangement comprises an inlet opening for the pressure medium which is arranged at an upper portion of the container and through which the pressure medium can be supplied into the container; wherein the arrangement comprises an outlet opening for the pressure medium, which is arranged on a lower portion of the container, and through which the pressure medium can be discharged from the container; wherein the arrangement comprises a ventilation device configured to supply a flow of gas into the container, a porous end portion of the ventilation device being arranged at a central lower position of the container so that bubbles of the gas are distributed into a portion of the container filled with the pressure medium and a flow of the bubbles forms from the bottom up in the portion of the container; wherein the outlet opening is arranged at a lower portion of the container below the porous end portion. This arrangement is particularly advantageous because it enables the pressure medium to be dehumidified and / or degassed efficiently in a very compact arrangement. The container is preferably more elongated to allow dehumidification to take place along the major axis of the container. By “elongated” it is meant that the container extends along a major axis and that the length of the container along this major axis is significantly greater than a length of the container measured along any other axis.

According to a further embodiment of the present invention, a treatment arrangement is provided, the arrangement further comprising a first pump configured to introduce the pressure medium into the container through the inlet opening; and wherein the arrangement further comprises a second pump configured to discharge the pressure medium from the container through the outlet opening. This solution enables the supply and discharge of the pressure medium to and from the container. In addition, it is possible to achieve a desired pressure within the container.

According to a further embodiment of the present invention, a processing arrangement is provided, wherein a pressure relief valve is arranged between the first pump and the inlet opening such that the pressure medium that is supplied to the container flows through the pressure relief valve. The pressure relief valve enables the temperature of the pressure medium that is fed into the container to be regulated. This solution does not make it possible to install an additional heat generation system for warming up the pressure medium between the first pump and the inlet opening. In addition, by setting the pressure relief valve, it is possible to achieve the desired pressure within the container. The pressure relief valve can be controlled manually or by means of an electrical control.

According to a further embodiment of the present invention, a processing arrangement is provided, the arrangement comprising an electric motor with a speed controller and / or power controller, which is configured to introduce a predetermined power into the pressure medium, which flows into the container via the pressure relief valve. This solution enables the temperature to be regulated by an electric motor.

According to a further embodiment of the present invention, a processing arrangement is provided, the arrangement further comprising a heat exchanger, wherein on one side of the heat exchanger the pressure medium that flows to the first pump is heated, and on the other side of the heat exchanger the pressure medium which flows from the second pump, is cooled. This solution makes it possible to effectively increase the energy efficiency of the arrangement. The reason for this is that less heat is required by this heat exchanger in order to reach a given temperature in the container.

According to a further embodiment of the present invention, a processing arrangement is provided, the arrangement further comprising a valve which opens or closes a connection between the pressure side of the first pump and the pressure side of the second pump. This solution enables the container to be emptied more efficiently. The reason for this is that the pressure medium can flow from the pressure side of the first pump to the pressure side of the second pump so that the amount of the pressure medium supplied into the container is decreased and the level of the pressure medium in the container becomes lower.

According to a further embodiment of the present invention, a treatment arrangement is provided, wherein the container furthermore has a second inlet opening; wherein the arrangement further comprises a valve that opens or closes a connection between the pressure side of the second pump and the second inlet port. This solution enables the container to be refilled more efficiently. The reason for this is that the pressure medium can flow from the pressure side of the second pump to the container so that the amount of the pressure medium supplied into the container can be increased.

According to a further embodiment of the present invention, a processing arrangement is provided, wherein the first and the second pump are arranged such that they are driven by the same motor and wherein the first and the second pump preferably have the same nominal volume flow. This solution allows a single motor to be installed to drive the two pumps. Due to the fact that the two pumps have the same nominal volume flow, it is possible to feed the same amount of pressure medium into the container and remove it from the container.

According to a further embodiment of the present invention, a treatment arrangement is provided, further comprising an outlet opening for the gas, which is arranged on an upper portion of the container and is configured to discharge the gas that collects on the upper portion of the container. This solution allows the gas that has been supplied into the container and the moisture contained in the gas to be carried outside.

According to a further embodiment of the present invention, a processing arrangement is provided, the ventilation device further comprising a gas delivery device, in particular a vacuum pump, which is connected to the outlet opening and which is configured to generate a negative pressure in a container section which is arranged above the inlet opening . This solution enables the gas to be removed from the container more efficiently.

According to a further embodiment of the present invention, a processing arrangement is provided, the container being provided with a vacuum connection which is in connection with a container section which is arranged above the inlet opening and which is in particular designed as a plug-in coupling. This solution enables a hydraulic control to be vacuum-filled. This can be, for example, a self-sufficient hydraulic compact axis or a hydraulic control that is intended for use under water. In the present invention, a line is advantageously provided which connects the upper section of the container, which is under negative pressure during operation, to a vacuum connection of the system through the negative pressure connection, so that no additional vacuum generation arrangement of its own has to be provided.

According to a further embodiment of the present invention, a processing arrangement is provided, wherein the ventilation device further comprises a proportional valve which is arranged at a position which is downstream of the gas conveyor and upstream of the porous end portion. This solution enables an automatic process adjustment, depending on the respective fluid. In this case, the terms “downstream” and “upstream” refer to a direction of flow that goes from the outlet opening to the porous end section.

According to a further embodiment of the present invention, a processing arrangement is provided, the ventilation device, the outlet opening and a gas delivery device forming an essentially closed circulation circuit for the gas. By means of this closed circulation circuit, it is possible to reintroduce all or part of the gas that is discharged from the container through the outlet opening into the container through the end section, so that the arrangement is more environmentally friendly.

According to a further embodiment of the present invention, a processing arrangement is provided, wherein said closed circulation circuit comprises a cooling device which is arranged downstream of the gas conveyor and is configured to cool the gas in order to condense the moisture contained in the gas, and wherein said closed circulation circuit preferably comprises a condensate container which is arranged between the gas conveying device and the porous end portion and is configured to accumulate the condensed moisture of the gas. The closed circulation circuit and the cooling device make it possible to achieve a low temperature during dehumidification, so that the gas can be dehumidified more efficiently.

According to a further embodiment of the present invention, a processing arrangement is provided, wherein a heat exchanger is arranged between a line leading from the gas conveying device to the cooling device and a line leading from the cooling device to the porous end section, so that the gas that flows to the cooling device, can be cooled and the gas flowing out of the cooling device can be heated. With this solution, the gas introduced into the container through the end portion is warmed up so that the dehumidifying of the pressure medium is carried out more efficiently. In addition, with such a solution it is possible to increase the energy efficiency of the arrangement. The reason for this is that less heat has to be removed by the cooling device.

According to a further embodiment of the present invention, a processing arrangement is provided, wherein a heat exchanger is arranged between a line leading from the outlet opening to the gas delivery device and a line leading from the cooling device to the porous end section, so that the gas that flows to the gas conveying device, can be cooled and the gas flowing out of the cooling device can be heated. With this solution, the gas introduced into the container through the end portion is warmed up so that the dehumidifying of the pressure medium becomes more effective. In addition, with such a solution it is possible to increase the energy efficiency of the arrangement. The reason for this is that less heat has to be removed by the cooling device.

Figure list

• 1 zeigt eine Darstellung des hydraulischen Schemas einer Aufbereitungsanordnung für das Trocknen eines hydraulischen Druckmittels gemäß einer Ausführungsform der vorliegenden Erfindung;
• 2 zeigt eine Darstellung des hydraulischen Schemas einer Aufbereitungsanordnung für das Trocknen eines hydraulischen Druckmittels gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;
• 3 bis 5 zeigen verschiedene Ansichten einer erfindungsgemäßen Aufbereitungsanordnung, gemäß einer weiteren Ausführungsform der vorliegenden Erfindung;

The present invention is described with reference to the accompanying figures, wherein like reference characters refer to like parts and / or to like parts and / or to corresponding parts of the system. To the figures:

• 1 shows a representation of the hydraulic scheme of a processing arrangement for drying a hydraulic pressure medium according to an embodiment of the present invention;
• 2 shows an illustration of the hydraulic scheme of a processing arrangement for drying a hydraulic pressure medium according to a further embodiment of the present invention;
• 3 to 5 show different views of a processing arrangement according to the invention, according to a further embodiment of the present invention;

DETAILED DESCRIPTION

In the following, the present invention will be described with reference to specific embodiments as shown in the accompanying figures. Nevertheless, the present invention is not limited to the particular embodiments described in the following detailed description and shown in the figures, but the described embodiments merely illustrate some aspects of the present invention, the scope of which is defined by the claims.

Other changes and variations of the present invention will be apparent to those skilled in the art. The present description thus includes all changes and / or variations of the present invention, the scope of which is defined by the claims.

In the present description, the term “pressure medium” means any medium that is used in industry to control hydraulic components, in particular hydraulic and lubricating oils.

In this description, the components are first presented by their arrangement and then the method is described in detail with which the individual components are used to prepare the pressure medium.

1 shows a representation of the hydraulic scheme of a processing arrangement 1000 for processing, or drying and / or degassing, a hydraulic pressure medium according to an embodiment of the present invention.

The preparation process takes place in a container 100 extending along an axis Ax1. The container 100 is cylindrical in this particular case.

The container 100 is filled with the pressure medium during the preparation process so that the moisture and / or the gas contained in the pressure medium can be removed from the pressure medium.

The container 100 has an inlet port 101 for the pressure medium on, which is attached to an upper portion of the container 100 is arranged and through which the pressure medium in the container 100 can be fed.

The container 100 furthermore has a second inlet opening 103 on that for refilling the container 100 can also be used.

The container 100 furthermore has an outlet opening 104 for the pressure medium on which at a lower portion of the container 100 is arranged and through which the pressure medium from the container 100 can be discharged. The outlet opening 104 is preferably located in the bottom of the container 100 .

The gas that is required for the treatment process is passed through a ventilation device 200 into the container 100 introduced. The ventilation device 200 includes an end portion 201 through which the gas enters the container 100 can flow in.

The end section 201 is made of porous material, preferably of porous metallic material, and can even be similar to a porous sintered filter, in particular like a pneumatic silencer made of porous sintered metal. This feature results in particularly fine bubbles and the transfer of moisture from the pressure medium into the bubbles is facilitated. Sintered filters and pneumatic mufflers are known per se and are commercially available.

Alternatively, the end section can be made from ceramic and / or from compression-molded, powdery plastics and / or from a multi-layer cloth. By means of these solutions, similar advantages can be achieved in each case.

The end section 201 is inside at a central lower position of the container 100 arranged. In particular is the distance between the bottom of the container 100 and the end section 201 the outflow device 200 along the axis Ax1 of the container 100 is measured, preferably less than 1/3 of the height of the container 100 , more preferably less than 1/4 the height of the container 100 , more preferably less than 1/5 the height of the container 100 , more preferably less than 1/6 the height of the container 100 , still more preferably less than 1/7 of the height of the container 100 .

A tube of the ventilation device 200 , at the end of which said end section 201 is arranged is in the container 100 through a side opening 102 of the container 100 used.

The gas that is on the top portion of the container 100 collects is through an outlet port 105 from the container 100 discharged.

The following paragraphs describe the ventilation device 200 described which the supply and discharge of the gas respectively to and from the container 100 allowed.

In the embodiment shown in 1 is shown, is a closed circulation circuit between the outlet port 105 and the end section 201 arranged. By means of this closed circulation circuit, it is possible to remove all of the gas that passes through the outlet opening 105 from the container 100 is discharged, or a part thereof, through the end portion 201 back in the container 100 to introduce.

The gas flows out of the outlet opening 105 by a vacuum pump 203 driven by an engine 204 can be driven. The vacuum pump 203 pumps the gas out of the container 100 and thus reduces the pressure inside the container from atmospheric pressure. A pressure between 0.05 and 0.5 bar is preferably set. (e.g. 0.3 bar) As in 1 can be seen is a 2/2 way valve 202 between the outlet port 105 and the vacuum pump 203 arranged.

As will be described in more detail in the course of the description, the vacuum pump is at the outlet 203 a heat exchanger 205 arranged, which is preferably a countercurrent heat exchanger.

On one side of the heat exchanger 205 the gas flowing out of the vacuum pump is cooled. The gas at the exit of the heat exchanger 205 is continued by a cooling device 211 cooled down. The cooler 211 can for example be a Peltier element, a cooling circuit or another means known from the prior art. The condensed moisture of the gas can then pass through a condensate container 207 accumulated.

On the other side of the heat exchanger 205 the gas coming out of the condensate tank is warmed up 207 flows so that the pressure medium in the container 100 can be dried more effectively.

Alternatively, the heat exchanger 205 between a conduit leading from the outlet port 105 to the vacuum pump 203 leads, and a conduit leading from the cooling device 211 to the porous end portion 201 leads to be arranged to allow the gas to flow to the vacuum pump 203 flows, can be cooled and the gas that comes out of the cooling device 211 flows away, can be warmed up.

As in 1 can be seen, is preferably a proportionally adjustable 2/2 way valve 208 between the heat exchanger 205 and the side opening 102 of the container 100 arranged. Optionally, this valve 208 can also be designed as a proportional valve. This solution enables an automatic process adjustment, depending on the respective fluid.

The closed circulation circuit is equipped with an outlet filter 206 connected, which is configured to vent the excess air from the closed circulation circuit into the external atmosphere.

In the following paragraphs the hydraulic system 300 describes which the supply and discharge of the pressure medium to and from the container 100 allowed.

The pressure medium is through the entrance 301 and preferably via a 2/2 way valve 303 by means of a first pump 308 into the hydraulic system 300 introduced.

Between the first pump 308 and the entrance 301 is preferably a heat exchanger 306 arranged, which is preferably a countercurrent heat exchanger. On one side of the heat exchanger 306 becomes the pressure medium that goes to the first pump 308 flows, warmed up to a higher temperature of the pressure medium in the container 100 to get during the reprocessing order.

As will be described in more detail in the course of the description, the heat exchanger is on the other side 306 the pressure medium cooled from the container 100 flows.

Between the heat exchanger 306 and the entrance 301 is preferably a low pressure filter 305 arranged, with which the particles flowing in the pressure medium can be at least partially filtered out. In addition, they are preferably in front of the low pressure filter 305 a pressure sensor 302 and / or an aqua sensor 304 arranged.

Between the filter 306 and the first pump 308 is preferably a pressure sensor 307 arranged.

Downstream of the first pump 308 is a pressure relief valve 311 arranged, of which Function is described in more detail in the course of the description. Between the inlet port 101 of the container 100 and the pressure relief valve 311 is preferably a high pressure filter 312 arranged, which is preferably finer than the low pressure filter 305 is.

As described above is an outlet port 104 for the pressure medium provided on a lower portion of the container 100 is arranged and through which the pressure medium from the container 100 can be discharged. In particular, the pressure medium is removed from the container 100 by means of a second pump 313 discharged.

As in 1 can be seen are the first pump 308 and the second pump 313 by the same engine 309 driven and coupled by a common shaft. It should be noted that this arrangement is not required for the aim of the present invention. The two pumps can also be driven by means of two different motors and be coupled by different types of connections.

It is beneficial to have the first pump 308 and the second pump 313 have the same nominal volume flow, so that the same amount of pressure medium in the container 100 through the inlet port 101 inserted and out of the container 100 through the outlet opening 104 can be discharged.

The motor 309 is preferably a servomotor, which is particularly light, so that the processing arrangement 1000 is easier to transport. The motor 309 is preferably frequency controlled.

Downstream of the second pump 313 three parallel flow paths are provided which can be used under different operating conditions.

A first flow path that occurs during the filling of the container 100 can be used, connects through a 2/2 way valve 315 the pressure side of the second pump 313 with the second inlet port 103 .

A second flow path that occurs during emptying of the container 100 can be used, connects through a 2/2 way valve 314 the pressure side of the second pump 313 with the pressure side of the first pump 308 .

A third flow path that occurs during normal operation of the processing arrangement 1000 can be used, connects the pressure side of the second pump 313 with an output of the processing arrangement. A tank of a unit, a hydraulic control block to be filled or some other external consumer that receives the dried and degassed pressure medium can be connected to this. This third flow path is preferably with the heat exchanger 306 connected to the pressure medium that comes from the second pump 313 flows, is cooled, and at the same time the pressure medium to the first pump 308 flows, is warmed up.

Downstream of the heat exchanger 306 is preferably a third filter 316 arranged, which is preferably finer than the low pressure filter 305 and as the high pressure filter 312 is. In addition, a preload valve blocks 317 the path to the outlet if the pressure of the pressure medium is lower than a predetermined value.

The processing order 100 can on a cart 400 be installed so that the processing arrangement 1000 can be easily transported. Such an arrangement can also be designed to be very compact.

As in the 3 to 5 is shown, a housing 1 is provided in which the filter 305 , 312 and 316 and other small components of the processing assembly 1000 are arranged on a front side 1a of the housing 1 and the container 100 and the other elements of the processing arrangement 1000 are arranged on the rear side 1b of the housing 1. In addition, the electronics required to control the processing arrangement 1000 is required, arranged on an upper cover 1c of the housing 1.

With this arrangement, a very compact machine is created which is easy to transport and which is particularly easy to maintain because the interchangeable components, e.g. the filters, are easy to extract.

On the right side of the 1 is a control cabinet with a display 600 shown, the operation of the processing arrangement 1000 allowed. This display is expediently arranged in the cover 1c of the housing.

On the right side of the 1 is still a system 700 arranged, which allows vacuum filling of a hydraulic control. This can be, for example, a self-sufficient hydraulic compact axis from the applicant or a hydraulic control that is intended for use under water. Such a system 700 is described in detail in the operating instructions BAL_Vol.03, which was published in August 2015 by Bosch Rexroth GmbH in Austria, and is preferably used for compact axes. In the present invention, a line 318 is advantageously provided, which in operation under a negative pressure upper portion of the container 100 with a vacuum connection of the system 700 through a vacuum connection 106 connects, so that no separate additional vacuum generation arrangement has to be provided.

In the following paragraphs, the process for processing, in particular drying and / or degassing, the pressure medium is described by means of the processing arrangement described above 1000 he follows.

For filling the container 100 the pressure medium is through the first pump 308 into the container 100 pumped. The valve is in this operating status 314 in a locked position and the valve 315 in an open position. With this setting, the pressure medium that is supplied by the second pump 313 from the container 100 through the outlet opening 104 is discharged, back into the container 100 through the second inlet port 103 fed.

The pressure medium is through the pressure relief valve 311 warmed up. In particular, the proportionally adjustable pressure relief valve 311 controlled by hand or by means of an electrical control so that a specified temperature downstream of the pressure relief valve 311 is achieved.

When a predetermined level of pressure medium in the container 100 is reached, the actual preparation process begins. For this purpose the valve 315 switched to the blocking position so that the level of the pressure medium in the container 100 remains constant.

After this switchover, pressure medium is continuously fed through the inlet opening 101 into the container 100 fed and through the outlet port 104 from the container 100 discharged.

After the predetermined level of pressure medium in the container 100 is reached, the ventilation device is at the same time 200 switched on so that the gas is introduced into the pressure medium and the drying and degassing of the pressure medium can start.

In particular, the vacuum pump 203 turned on to allow bubbles of gas to pass through the end section 201 flow into a section of the container filled with the pressure medium 100 are distributed and a flow of the bubbles from the bottom up in the section of the container 100 forms. The vesicles collect on an upper portion of the container 100 , at the outlet opening 105 .

The many small gas bubbles have a large surface compared to the gas volume and therefore absorb moisture from the pressure medium very quickly. Moisture contained in the pressure medium therefore passes into the gas bubbles and can, together with the gas bubbles, to the outlet opening 105 stream. When the gas bubbles emerge from the pressure medium, the absorbed moisture is removed from the pressure medium at the same time.

The absorption capacity of the gas bubbles is also increased by the heating of the gas, which is generated by the heat exchanger 205 takes place, increased. In addition, the partial vapor pressure of the water dissolved in the pressure medium increases, which also favors a transition into the gas phase.

In particular, the gas that comes out of the container 100 through the outlet opening 105 is discharged by the vacuum pump 203 promoted. The gas is then passed through the heat exchanger 205 cooled in a first cooling process.

At a section that is downstream of the heat exchanger 205 is arranged, the gas is in a second cooling process through the cooling device 211 continued to cool.

The moisture removed from the pressure medium by the gas bubbles condenses through these two cooling processes and this condensed moisture can enter the condensate container 207 be discharged.

The cooled, drier gas can then pass through the heat exchanger again 205 be warmed up and in the container 100 are fed.

The heat of the gas coming through the vacuum pump 203 is conveyed is with the gas, which has been cooled by means of the second cooling process, through the heat exchanger 205 exchanged.

With this arrangement, temperatures of the gas can be up to 5 ° C downstream of the cooling device 211 can be achieved so that the moisture obtained can be removed from the gas more effectively and at the same time by means of the heat exchanger 205 a temperature up to 35 ° C at the end portion 201 .

While the pressure medium through the pumps 308 and 313 to and from the container 100 flows, the gas is in the container 100 through the end section 201 supplied and withdrawn again by means of negative pressure, so that the pressure medium that is in the container 100 is supplied, can be dried and / or degassed. It is therefore possible with such a system to continuously dry and degas a pressure medium.

Optionally on the hydraulic system 300 an oxygen sensor for monitoring the air content of the pressure medium can be installed so that pressure medium aging can be detected. In addition, the total gas content can also be inferred from the oxygen content.

When the container 100 needs to be emptied, e.g. B. when the processing has to be ended, the valve 314 switched to the open position so that the level of the pressure medium in the container 100 can sink. This switching over is the pressure medium that comes from the first pump 308 flows through the valve 314 to the pressure side of the second pump 313 fed and thus to the exit 317 the processing order 1000 .

After the container 100 has been completely emptied, the valve 314 switched back to the locked position, and the motor 309 who is the pumps 308 , 313 drives, switched off.

In the 2 is a further embodiment of the processing arrangement according to the invention 1000 shown schematically. Here are features that match those of the 1 are provided with the same reference numerals. The description is not repeated. Rather, the differences to the one in the 1 embodiment shown.

Alternative to the ventilation device 200 , which is provided with the closed circulation circuit, can, as in 2 is shown a ventilation device 200 ' be implemented with an open circulation circuit. In this case, compressed air is taken directly from a compressed air source 209 into the container 100 fed. Alternatively, air from the environment can also be supplied through an intake opening. Here, too, the driving force for the air flow or gas flow is the vacuum pump (reference number in 2 ) in the top section of the container 100 creates a negative pressure, causing air or gas over the end portion 201 is sucked up.

In this case the air is drawn by means of the vacuum pump 203 sucked in through a filter 210 discharged into an external atmosphere. The other components function similarly to the components used in the ventilation device 200 with a closed circulation circuit have been described in detail.

For the previously addressed case of using compressed air from the compressed air source 209 the rule is that compressed air is already very dry anyway. A compressed air supply system, for example, is already available in many factory buildings to supply pneumatic consumers. The investment requirement for a separate compressed air supply can therefore often be dispensed with when using the hydraulic arrangement according to the invention.

As already mentioned, compressed air is drier than the ambient air due to its generation, which includes compression and often also subsequent cooling with the removal of condensation water. But even if the compressed air had a relative humidity of 100%, its relative humidity would decrease when it was introduced into the pressure medium in the course of decompression and volume increase. The quotient of the relative humidity values in the air is proportional to the quotient of the pressures.

So you relax on the ventilation device 200 ' the compressed air from 6 bar to 1 bar, for example, the relative humidity decreases from a maximum of 100% to 16.7%. When using a pneumatic compressed air source 17, the humidity of the compressed air is, however, significantly lower. In addition, when the compressed air is heated, the relative humidity usually falls even further in the heated pressure medium. It can be assumed that the compressed air can absorb about 40 g of water ^{per m 3.} It is therefore possible to remove large amounts of water from the liquid pressure medium with comparatively little and inexpensively available compressed air.

While the present invention has been described with reference to the embodiments described above, it will be apparent to those skilled in the art that it is possible to implement various modifications, variations, and improvements of the present invention in light of the above teachings and within the scope of the appended claims without departing from the scope of the invention.

Even if the container 100 has been shown in the figures with a cylindrical shape, such a shape is not required. The container 100 could also be a prism with an elliptical base and preferably two end sections 201 the ventilation device 200 each arranged at the focal points of the ellipse. In addition, the container could have any other elongate shape.

In addition, in order not to unnecessarily obscure the described invention, the areas that would be skilled in the art have not been described here.

Accordingly, it is intended that the invention not be limited by the specific illustrative embodiments, but rather by the scope of the appended claims.

List of reference symbols

100:

Container;

101:

Inlet port;

102:

Opening;

103:

second inlet port;

104:

Outlet opening for the pressure medium;

105:

Outlet opening for the gas;

106:

Vacuum connection;

200, 200 ':

Ventilation device;

201:

End section;

202:

Valve;

203:

Vacuum pump;

204:

Vacuum pump motor;

205:

Heat exchanger;

206:

Outlet filter;

207:

Condensate tank;

208:

Valve;

209:

Compressed air source;

210:

Filter;

211:

Cooling device;

300:

hydraulic system;

301:

Hydraulic system input;

302:

Pressure sensor;

303:

Valve;

304:

Aquasensor;

305:

Low pressure filter;

306:

Heat exchanger;

307:

Pressure sensor;

308:

first pump;

309:

Engine;

310:

Pressure sensor;

311:

Pressure relief valve;

312:

High pressure filter;

313:

second pump;

314,315:

Valves;

316:

Filter;

317:

Check valve;

400:

Dare;

600:

Switch cabinet;

700:

Vacuum filling system;

1000:

Processing order.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016226283 A1 [0002]

Claims (20)

Method for degassing and / or drying a hydraulic pressure medium, comprising the following steps: Supplying pressure medium into a container (100) through an inlet opening (101) of the container (100), the inlet opening (101) being arranged at an upper portion of the container (100); Feeding gas into the container (100) through a ventilation device (200, 200 '), wherein a porous end portion (201) of the ventilation device (200, 200') is arranged at a central lower position of the container (100), so that bubbles of the Gas are distributed in a section of the container (100) filled with the pressure medium and a bottom-up flow of the bubbles forms in the portion of the container (100); Discharge of the pressure medium from the container (100) through an outlet opening (104) of the container (100), the outlet opening (104) being arranged on a lower section of the container (100) below the porous end section (201). Processing arrangement (1000) for degassing and / or drying a hydraulic pressure medium, the arrangement (1000) comprising: a container (100) configured to hold a predetermined amount of pressure medium; an inlet opening (101) for the pressure medium, which is arranged at an upper portion of the container (100) and through which the pressure medium can be supplied into the container (100); an outlet opening (104) for the pressure medium, which is arranged on a lower section of the container (100) and through which the pressure medium can be discharged from the container (100); a ventilation device (200, 200 ') configured to supply a flow of gas into the container (100), wherein a porous end portion (201) of the ventilation device (200, 200') is at a central lower position of the container (100) is arranged so that bubbles of the gas are distributed in a section of the container (100) filled with the pressure medium and a flow of the bubbles is formed from bottom to top in the section of the container (100); wherein the outlet opening (104) is arranged at a lower portion of the container (100) below the porous end portion (201). Processing arrangement (1000) according to Claim 2 further comprising: a first pump (308) configured to introduce the pressure medium into the container (100) through the inlet port (101); and a second pump (313) configured to discharge the pressure medium from the container (100) through the outlet opening (104). Processing arrangement (1000) according to Claim 3 , wherein a pressure relief valve (311) is arranged between the first pump (308) and the inlet opening (101) so that the pressure medium which is supplied to the container (100) flows through the pressure relief valve (311). Processing arrangement (1000) according to Claim 4 , wherein the arrangement (1000) comprises an electric motor (309) with speed controller and / or power controller, which is configured to introduce a predetermined power into the pressure medium, which flows off via the pressure limiting valve (311) into the container (100). Processing arrangement (1000) according to one of the Claims 3 to 5 , wherein the arrangement (1000) further comprises a heat exchanger (306), wherein on one side of the heat exchanger (306) the pressure medium which flows to the first pump (308) is warmed up, and on the other side of the heat exchanger (306) the pressure medium flowing out of the second pump (313) is cooled. Processing arrangement (1000) according to one of the Claims 3 to 6th , wherein the arrangement (1000) further comprises a valve (314) which opens or closes a connection between the pressure side of the first pump (308) and the pressure side of the second pump (313). Processing arrangement (1000) according to one of the Claims 3 to 7th wherein the container (100) further has a second inlet port (103); wherein the arrangement (1000) further comprises a valve (315) which opens or closes a connection between the pressure side of the second pump (313) and the second inlet opening (103). Processing arrangement (1000) according to one of the Claims 3 to 8th , wherein the first and the second pump (308, 313) are arranged so that they are driven by the same motor (309) and wherein the first and the second pump (308, 313) preferably have the same nominal volume flow. Processing arrangement (1000) according to one of the Claims 2 to 9 further comprising an outlet opening (105) for the gas, which is arranged on an upper portion of the container (100) and is configured to discharge the gas that collects on the upper portion of the container (100). Processing arrangement (1000) according to Claim 10 , wherein the ventilation device (200, 200 ') further comprises a gas delivery device, in particular a vacuum pump (203), which is connected to the outlet opening (105) and which is configured to generate a negative pressure in a container portion which is arranged above the inlet opening (101). Processing arrangement (1000) according to Claim 11 wherein the ventilation device (200, 200 ') further comprises a proportional valve (208) arranged at a position that is downstream of the gas conveyor (203) and upstream of the porous end portion (201). Processing arrangement (1000) according to one of the Claims 2 to 12th , wherein the container (100) is provided with a vacuum connection (106) which is connected to a container section which is arranged above the inlet opening (101) and which is in particular designed as a plug-in coupling. Processing arrangement (1000) according to one of the Claims 11 to 13th , wherein the ventilation device (200), the outlet opening (105) and a gas delivery device (203) form a substantially closed circulation circuit for the gas. Processing arrangement (1000) according to Claim 14 , wherein said closed circulation circuit comprises a cooling device (211) which is arranged downstream of the gas conveyor (203) and is configured to cool the gas in order to condense the moisture contained in the gas, and wherein said closed circulation circuit preferably comprises a condensate container (207 ) arranged between the gas conveyor (203) and the porous end portion (201) and configured to accumulate the condensed moisture of the gas. Processing arrangement (1000) according to Claim 15 , wherein a heat exchanger (205) is arranged between a line leading from the gas conveyor (203) to the cooling device (211) and a line leading from the cooling device (211) to the porous end portion (201) therewith the gas flowing to the cooling device (211) can be cooled and the gas flowing out of the cooling device (211) can be warmed up. Processing arrangement (1000) according to Claim 15 wherein a heat exchanger (205) is arranged between a line leading from the outlet opening (105) to the gas delivery device (203) and a line leading from the cooling device (211) to the porous end portion (201), therewith the gas flowing to the gas conveyor (203) can be cooled and the gas flowing out of the cooling device (211) can be heated. Processing arrangement (1000) according to one of the Claims 2 to 17th wherein said porous end section (201) of the ventilation device (200, 200 ') consists of sintered metal and / or of ceramic and / or of compression-molded powdery plastics and / or of a multi-layer cloth. Processing arrangement (1000) according to one of the Claims 2 to 18th wherein the container (100) is cylindrical and the end portion (201) of the ventilation device (200, 200 ') extends along the axis (Axi) of the cylinder. Processing arrangement (1000) according to one of the Claims 2 to 19th , wherein the end section (201) of the ventilation device (200, 200 ') is rotationally symmetrical and uniformly porous.

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